How to get the script out of the game:

Run arc_conv to get everything out of the "ysbin.ypf" file.  This will extract EVERYTHING so make sure you have enough disk space.

Move the subdirectories created into the main directory.  You can delete anything you don't need, but keep the "ysbin" directory.

Run the script thing, tell it where the "ysbin" directory is.

Extract the script, edit text, then insert the script.

Known Issues:
This is not the finished hacking tool for this game, it's an early version.
After changing character names, they don't appear correctly.
Changing certain text strings may break the game, so don't change any text that looks like it won't be displayed.
You can't add or remove lines, and there is no word wrap yet.